A combo of 3 successful tuning patches

Shelter Weakness by Fauzi Akram Dabat
Threats by Alain Savard
Passed Pawns by Alain Savard

STC:
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 51378 W: 11592 L: 11223 D: 28563
http://tests.stockfishchess.org/tests/view/5a79e2fe0ebc5902971a99d1

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 21631 W: 3888 L: 3661 D: 14082
http://tests.stockfishchess.org/tests/view/5a7aefe80ebc5902971a9a39

Bench: 4983414

src/evaluate.cpp

@@ -185,22 +185,22 @@ namespace {
   // which piece type attacks which one. Attacks on lesser pieces which are
   // pawn-defended are not considered.
   const Score ThreatByMinor[PIECE_TYPE_NB] = {
-    S(0, 0), S(0, 33), S(45, 43), S(46, 47), S(72, 107), S(48, 118)
+    S(0, 0), S(0, 31), S(39, 42), S(57, 44), S(68, 112), S(47, 120)
   };
 
   const Score ThreatByRook[PIECE_TYPE_NB] = {
-    S(0, 0), S(0, 25), S(40, 62), S(40, 59), S(0, 34), S(35, 48)
+    S(0, 0), S(0, 24), S(38, 71), S(38, 61), S(0, 38), S(36, 38)
   };
 
   // ThreatByKing[on one/on many] contains bonuses for king attacks on
   // pawns or pieces which are not pawn-defended.
-  const Score ThreatByKing[] = { S(3, 62), S(9, 138) };
+  const Score ThreatByKing[] = { S(3, 65), S(9, 145) };
 
   // Passed[mg/eg][Rank] contains midgame and endgame bonuses for passed pawns.
   // We don't use a Score because we process the two components independently.
   const Value Passed[][RANK_NB] = {
-    { V(0), V(5), V( 5), V(31), V(73), V(166), V(252) },
-    { V(0), V(7), V(14), V(38), V(73), V(166), V(252) }
+    { V(0), V(5), V( 5), V(32), V(70), V(172), V(217) },
+    { V(0), V(7), V(13), V(42), V(70), V(170), V(269) }
   };
 
   // PassedFile[File] contains a bonus according to the file of a passed pawn
@@ -210,7 +210,7 @@ namespace {
   };
 
   // Rank factor applied on some bonus for passed pawn on rank 4 or beyond
-  const int RankFactor[RANK_NB] = {0, 0, 0, 2, 6, 11, 16};
+  const int RankFactor[RANK_NB] = {0, 0, 0, 2, 7, 12, 19};
 
   // KingProtector[PieceType-2] contains a bonus according to distance from king
   const Score KingProtector[] = { S(-3, -5), S(-4, -3), S(-3, 0), S(-1, 1) };
@@ -224,13 +224,13 @@ namespace {
   const Score WeakQueen             = S( 50, 10);
   const Score CloseEnemies          = S(  7,  0);
   const Score PawnlessFlank         = S( 20, 80);
-  const Score ThreatBySafePawn      = S(192,175);
+  const Score ThreatBySafePawn      = S(175,168);
   const Score ThreatByRank          = S( 16,  3);
-  const Score Hanging               = S( 48, 27);
+  const Score Hanging               = S( 52, 30);
   const Score WeakUnopposedPawn     = S(  5, 25);
-  const Score ThreatByPawnPush      = S( 38, 22);
-  const Score ThreatByAttackOnQueen = S( 38, 22);
-  const Score HinderPassedPawn      = S(  7,  0);
+  const Score ThreatByPawnPush      = S( 47, 26);
+  const Score ThreatByAttackOnQueen = S( 42, 21);
+  const Score HinderPassedPawn      = S(  8,  1);
   const Score TrappedBishopA1H1     = S( 50, 50);
 
   #undef S
@@ -690,7 +690,7 @@ namespace {
 
                 // If there aren't any enemy attacks, assign a big bonus. Otherwise
                 // assign a smaller bonus if the block square isn't attacked.
-                int k = !unsafeSquares ? 18 : !(unsafeSquares & blockSq) ? 8 : 0;
+                int k = !unsafeSquares ? 20 : !(unsafeSquares & blockSq) ? 9 : 0;
 
                 // If the path to the queen is fully defended, assign a big bonus.
                 // Otherwise assign a smaller bonus if the block square is defended.

src/pawns.cpp

@@ -46,14 +46,14 @@ namespace {
   // Weakness of our pawn shelter in front of the king by [isKingFile][distance from edge][rank].
   // RANK_1 = 0 is used for files where we have no pawns or our pawn is behind our king.
   const Value ShelterWeakness[][int(FILE_NB) / 2][RANK_NB] = {
-    { { V( 97), V(17), V( 9), V(44), V( 84), V( 87), V( 99) }, // Not On King file
-      { V(106), V( 6), V(33), V(86), V( 87), V(104), V(112) },
-      { V(101), V( 2), V(65), V(98), V( 58), V( 89), V(115) },
-      { V( 73), V( 7), V(54), V(73), V( 84), V( 83), V(111) } },
-    { { V(104), V(20), V( 6), V(27), V( 86), V( 93), V( 82) }, // On King file
-      { V(123), V( 9), V(34), V(96), V(112), V( 88), V( 75) },
-      { V(120), V(25), V(65), V(91), V( 66), V( 78), V(117) },
-      { V( 81), V( 2), V(47), V(63), V( 94), V( 93), V(104) } }
+    { { V( 98), V(20), V(11), V(42), V( 83), V( 84), V(101) }, // Not On King file
+      { V(103), V( 8), V(33), V(86), V( 87), V(105), V(113) },
+      { V(100), V( 2), V(65), V(95), V( 59), V( 89), V(115) },
+      { V( 72), V( 6), V(52), V(74), V( 83), V( 84), V(112) } },
+    { { V(105), V(19), V( 3), V(27), V( 85), V( 93), V( 84) }, // On King file
+      { V(121), V( 7), V(33), V(95), V(112), V( 86), V( 72) },
+      { V(121), V(26), V(65), V(90), V( 65), V( 76), V(117) },
+      { V( 79), V( 0), V(45), V(65), V( 94), V( 92), V(105) } }
   };
 
   // Danger of enemy pawns moving toward our king by [type][distance from edge][rank].